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Part 1:  1  2  3  4  5  6          Part 2:  A  B  C  D  E 
International application No. Applicant's or agent's file reference
PCT/EP2015/078023 I15067-WO
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
30 November 2015
FOR FURTHER ACTION: See Form PCT/ISA/220 as well as, where applicable, item 5 below.
This international search report has been prepared by this International Searching Authority and is transmitted to the applicant according to Article 18. A copy is being transmitted to the International Bureau.
It is also accompanied by a copy of each prior art document cited in this report.
1. Basis of the report
a. With regard to the language, the international search was carried out on the basis of:
the international application in the language in which it was filed.
a translation of the international application into                                          which is the language of a translation furnished for the purposes of international search (Rules 12.3(a) and 23.1(b)).
This international search report has been established taking into account the rectification of an obvious mistake authorized by or notified to this Authority under Rule 91 (Rule 43.6bis(a)).
With regard to any nucleotide and/or amino acid sequence disclosed in the international application, the international search was carried out on the basis of a sequence listing:
2. Certain claims were found unsearchable
3. Unity of invention is lacking
4. Title of the invention
The text is approved as submitted by the applicant.
The text has been established by this Authority to read as follows:
5. Abstract
The text is approved as submitted by the applicant.
The text has been established, according to Rule 38.2, by this Authority as it appears in Box No. IV. The applicant may, within one month from the date of mailing of this international search report, submit comments to this Authority.

A method is provided for selecting routing paths of data packets in a data network which comprises a plurality of communication links and routing apparatuses. The method comprises: calculating and assigning (220) to the communication links respective communication links' costs; calculating (230), for at least two different routing paths in the data network, each routing path being made up by at least one communication link, respective routing path overall costs, wherein the overall cost of a routing path depends on the communication links' costs assigned to the communication links making up such routing path; selecting (230), among the at least two different routing paths, the routing path having the lower routing path overall cost, and causing a new data packet to be routed in the data network over the selected routing path. The method further comprises collecting (210) measures indicative of at least one performance parameter indicating a performance of previous transmissions of data packets from origin end points of the data network to destination end points of the data network, and using said collected measures for calculating said communication links' costs. The at least one performance parameter includes at least one of the following performance parameters: end- to-end transfer time; round-trip delay time; end-to-end jitter; variation in the round-trip delay time; end-to-end data packet loss ratio; round- trip data packet loss ratio. Every time period p (205), a measure collector entity collects the measures of the end-to-end performance parameters made by the network. Every time period p, a links' costs calculator obtains (215) from a network controller topological data regarding the data network and the resources thereof used for the routing of the data traffic flows active during the time period p and in respect of which the end-to-end performance parameters measures are available. The links' costs calculator calculates (220) the costs of the different links of the data network and stores (223) the calculated links' costs to be ready to be provided to the network controller. The network controller may be centralized as in a software defined network (SDN).

6. Drawings
The figure of the drawings to be published with the abstract is Figure No.     2    
as suggested by the applicant.
as selected by this Authority, because the applicant failed to suggest a figure.
as selected by this Authority, because this figure better characterizes the invention.
none of the figures is to be published with the abstract.


     H04L 12/721 (2013.01)i; H04L 12/715 (2013.01)i
According to International Patent Classification (IPC) or to both national classification and IPC


Minimum documentation searched (classification system followed by classification symbols):
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched:
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
EPO-Internal, WPI Data


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
WO 2015106794 A1 (HUAWEI TECH CO LTD [CN]; PORAT HAYIM [DE]) 23 July 2015 (2015-07-23)
page 6, line 17 - page 20, line 20
US 2001037409 A1 (RICCIULLI LIVIO [US]) 01 November 2001 (2001-11-01)
paragraphs [0006] - [0008], [0017] - [0057]
WO 2015133950 A1 (ERICSSON TELEFON AB L M [SE]) 11 September 2015 (2015-09-11)
page 5, line 25 - page 16, line 16
Special categories of cited documents:
document defining the general state of the art which is not considered to be of particular relevance
earlier application or patent but published on or after the international filing date
document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified)
document referring to an oral disclosure, use, exhibition or other means
document published prior to the international filing date but later than the priority date claimed
later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention
document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone
document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the art
document member of the same patent family


Patent document cited in search report Publication date
Patent family member(s) Publication date
WO 2015106794 A1
23 July 2015
US 2001037409 A1
01 November 2001
AT 383013 T
AU 5620900 A
CA 2374621 A1
DE 60037660 T2
EP 1188280 A2
EP 1898571 A2
JP 4677155 B2
JP 2003502941 A
US 6275470 B1
US 2001037409 A1
US 2002018449 A1
US 2004022194 A1
US 2011228678 A1
WO 0079730 A2
15 January 2008
09 January 2001
28 December 2000
06 November 2008
20 March 2002
12 March 2008
27 April 2011
21 January 2003
14 August 2001
01 November 2001
14 February 2002
05 February 2004
22 September 2011
28 December 2000
WO 2015133950 A1
11 September 2015
Name and mailing address of the ISA/:
European Patent Office
P.B. 5818, Patentlaan 2, 2280 HV Rijswijk,
Telephone No. (+31-70)340-2040
Facsimile No. (+31-70)340-3016
Date of the actual completion of the international search:
08 July 2016
Date of mailing of the international search report:
18 July 2016
Authorized officer:
Köppl, Martin
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